(19)

(11)

EP 2 550 782 A2

(12)

(88) Date of publication A3: 01.12.2011 (43) Date of publication: 30.01.2013 Bulletin 2013/05 (21) Application number: 11709491.2 (22) Date of filing: 23.02.2011

(51) International Patent Classification (IPC):  H04L 25/03(2006.01) (86) International application number: PCT/IB2011/050735 (87) International publication number: WO 2011/117762 (29.09.2011 Gazette 2011/39)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 23.03.2010 US 729414 (71) Applicant: Telefonaktiebolaget L M Ericsson (PUBL) 164 83 Stockholm (SE)	(72) Inventors: GRANT, Stephen Pleasanton, California 94566 (US) BOTTOMLEY, Gregory E. Cary, North Carolina 27518 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)